CN104048986A - PLIF-PIV (planar laser induced fluorescence-particle image velocimetry) visible pool boiling experiment device heater - Google Patents
PLIF-PIV (planar laser induced fluorescence-particle image velocimetry) visible pool boiling experiment device heater Download PDFInfo
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- CN104048986A CN104048986A CN201410298766.2A CN201410298766A CN104048986A CN 104048986 A CN104048986 A CN 104048986A CN 201410298766 A CN201410298766 A CN 201410298766A CN 104048986 A CN104048986 A CN 104048986A
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Abstract
The invention aims at providing a PLIF-PIV (planar laser induced fluorescence-particle image velocimetry) visible pool boiling experiment device heater which mainly comprises a heating surface base, a heating surface upper cover plate, a heating surface bottom fastening block, ITO glass, a conductive copper foil, a heat insulation ring, a heating surface upper cover plate sealing ring, a boiled surface sealing ring and a fastening screw, wherein the heating surface upper cover plate and the heating surface bottom fastening block are fixed on the heating surface base through fastening screws; the ITO glass is clamped between the heating surface upper cover plate and the heating surface bottom fastening block; the heat insulation ring is positioned at the bottom of the ITO glass; the conductive copper foil is tightly connected with the ITO glass and serves as a heating electrode; the heating surface upper cover plate sealing ring is positioned between the heating surface upper cover plate and the heating surface base; and the boiled surface sealing ring is positioned between the heating surface upper cover plate and the ITO glass. The PLIF-PIV visible pool boiling experiment device heater can meet a requirement on optical visualization of a PLIF-PIV technology; and the thermal flux of a boiled surface is set according to a preset distribution form, so that changes of a temperature field and a velocity field around bubbles are researched.
Description
Technical field
What the present invention relates to is a kind of experimental provision, and experimental provision specifically seethes with excitement.
Background technology
Boiling behavior is extensively present in multiple heat transmission equipment as a kind of efficient heat exchange mode, as the refrigeratory of microelectronic device, air-conditioning and nuclear reactor etc.Yet due to the complex characteristics of steam bubble behavior, still insufficient to its research, thereby limited to a great extent the application of boiling heat transfer.Steam bubble temperature field and velocity field around has important impact to the research of steam bubble behavior, because the less employing conventional method of yardstick is difficult to realize accurately, measures.The temperature field that PLIF (plane induced fluorescence)-PIV (plane particle tests the speed) technology can be obtained in liquid inner plane simultaneously distributes and velocity field distribution, is conducive to the further research to steam bubble behavior and boiling behavior.Yet general boiling heating arrangement is due to the visual demand of not considering in PLIF-PIV research, and the very difficult requirement that meets experiment of the heating arrangement of design due to the shortcoming in sealing and heat flow density control, is difficult to obtain good experimental result simultaneously.
Summary of the invention
The object of the present invention is to provide for studying the visual pool boiling experimental provision of the PLIF-PIV well heater of the variation of temperature field around of steam bubble and velocity field.
The object of the present invention is achieved like this:
The visual pool boiling experimental provision of PLIF-PIV of the present invention well heater, is characterized in that: comprise ito glass, left unit heater, right unit heater, left unit heater comprises hot face upper cover plate, hot face pedestal, hot face bottom fastening block, boiling surface O-ring seal, adiabatic circle, copper-foil conducting electricity, the section of hot face pedestal and hot face bottom fastening block is the L-type for consisting of short section and long section all, the long section of the long section of hot face pedestal and hot face bottom fastening block fixes, and the long section of hot face pedestal is positioned at the top of the fastening block length section in hot face bottom, the short section of hot face pedestal is towards below, hot face upper cover plate is fixed on the top of hot face pedestal and has extension with respect to hot face pedestal, the extension of hot face upper cover plate is relative with the short section of hot face bottom fastening block, the left part of ito glass is arranged between the extension of hot face upper cover plate and the short section of hot face bottom fastening block, boiling surface O-ring seal is installed between the extension of the left part of ito glass and hot face upper cover plate, between the left part of ito glass and hot face bottom fastening block, copper-foil conducting electricity is installed successively, adiabatic circle, right unit heater is identical with left unit heater structure, and right unit heater is identical with left unit heater with the assembly relation of ito glass.
The present invention can also comprise:
1, described ito glass comprises substrate, is coated with ITO plated film on the middle part of substrate, and the left end of ITO plated film arranges conductive tape with the part that right-hand member is connected with the copper-foil conducting electricity of left unit heater and right unit heater respectively.
2, sealing conduit is offered in the upper surface setting of hot face pedestal, in sealing conduit, hot face upper cover plate O-ring seal is installed, and the lower surface of the short section of hot face pedestal is offered well heater sealing conduit and well heater screw.
3, the material of hot face upper cover plate O-ring seal is nitrile rubber; Sealing conduit is rectangular duct through Milling Process, and its width is 3mm, and groove depth is 2mm; Width and the degree of depth of well heater sealing conduit are all 5mm; The material of boiling surface O-ring seal is silica gel; The substrate of ito glass is the sapphire glass of thickness 1.1mm; Adiabatic circle is processed by epoxy resin, and thickness is 2mm; The gap size of the hot face bottom short section of fastening block and the long section of hot face pedestal is 1mm.
Advantage of the present invention is:
(1) adopt ito glass to make the present invention possess better effect of visualization as boiling surface and heating element, and its surface heat flux can better control, thereby obtain the greatly scope of way of extensive experimentation parameter of higher heat flow density.
(2) PLIF-PIV of independent design boiling experimental provision has higher applicability, by simple Vessel Design, changes the boiling steam bubble behavior of various walls under condition of just can studying respectively.
(3) the present invention can eliminate the boiling phenomenon at position, corner to a great extent, to high-speed photography, takes steam bubble image and in conjunction with PLIF-PIV technology, the measurement of steam bubble temperature field surrounding and velocity field is brought convenience.
Accompanying drawing explanation
Fig. 1 is cut-open view of the present invention;
Fig. 2 a is ito glass structural representation a of the present invention, and Fig. 2 b is ito glass structural representation b of the present invention.
Embodiment
Below in conjunction with accompanying drawing, for example the present invention is described in more detail:
In conjunction with Fig. 1～2, the visual pool boiling experimental provision of PLIF-PIV involved in the present invention well heater mainly comprises following a few part, hot face pedestal 1, hot face upper cover plate 2, hot face bottom fastening block 3, ito glass 4, copper-foil conducting electricity 5, adiabatic circle 6, hot face upper cover plate O-ring seal 7, boiling surface O-ring seal 8, holding screw 9, well heater sealing conduit 10, sealing conduit 11 and well heater screw 12.Boiling surface is rectangle, and hot face pedestal 1, hot face upper cover plate 2 and hot face bottom fastening block 3 are all processed by stainless steel.In order to guarantee machining precision, hot face upper cover plate directly adopts the stainless steel printed line cutting processing of 1mm thickness.Fastening by holding screw 9, is clipped in ito glass 4 in the middle of these structures, and forms sealing by boiling surface O-ring seal 8, has avoided the generation of revealing.
The material of hot face upper cover plate O-ring seal 7 is nitrile rubber, and this heating arrangement designs mainly for the water boiling under condition of normal pressure, and the heatproof of nitrile rubber can reach 100 degrees Celsius, therefore can meet the requirement of design.Hot face upper cover plate O-ring seal 7 is positioned at the sealing conduit 11 of processing in advance on hot face pedestal 1, can be fixed on the effect that is not subjected to displacement and realizes sealing in groove.Seal groove is rectangular duct through Milling Process, and its width is 3mm, and groove depth is 2mm.In addition, be also provided with well heater sealing conduit 10 in the bottom of hot face pedestal, conduit width and the degree of depth are all 5mm, for well heater, are installed to the sealing after container.
Boiling surface O-ring seal 8 is formed by silica gel plate cutting, between ito glass 4 and hot face upper cover plate 2.Although here boiling surface O-ring seal 8 places do not have heat generation, however its near heating location because the operative temperature of laterally heat conduction is higher, therefore adopt the heatproof silicone gasket above up to 200 degrees Celsius.The processing of silicone gasket is comparatively easy, and cost is lower.Here boiling surface O-ring seal 8 has not only played the effect of sealing, and the while also provides space for the thermal deformation of ito glass 4, thereby effectively protected ito glass 4 to be unlikely to, because expand with heat and contract with cold, breaks.
The preparation of ito glass 4 is most important in the present invention, and the present invention adopts the ultraviolet development etching method that cost is lower and reliability is higher to be prepared it.The substrate 14 of ito glass 4 is the sapphire glass of thickness 1.1mm, has higher coefficient of heat conductivity, can effectively reduce the inner and outer plates temperature difference.The ITO plated film of ito glass 4 edges is got rid of by etching technique, exposes substrate 14, can eliminate like this heating at position, corner, as shown in Figure 2.
After being ready to the ito glass 4 of the complete machine-shaping of etching, the conductive tape 15 of the suitable size of cutting is affixed on the one side that ito glass 4 has ITO plated film 13, by its compression and from other one side, confirm not form space, guarantee the good contact between conductive tape and ITO plated film.In the design, the electrode of ito glass 4 is made by copper-foil conducting electricity 5, and first the red copper foil of the suitable size of cutting, bends according to the shape in Fig. 1, thereby notes repeatedly not fractureing in bending process Copper Foil or reduce its electric conductivity.
In the present invention, related thermal insulation circle 6 is positioned at the bottom as the ito glass 4 of the area of heating surface, has both played the heat insulating function to hot face pedestal, also the insulating material between conduct and hot face pedestal 1.In the present invention, adiabatic circle 6 is processed by epoxy resin, thickness is 2mm, first monoblock epoxy resin board is processed into the rectangular slab identical with ito glass 4 sizes, further Jiang Qi empties at center, become hollow, rectangular, so that observe from bottom to the steam bubble behavior boiling surface, provide laser sheet optical from bottom, to irradiate the light path of boiling range simultaneously.
Whole well heater is fixed together by holding screw 9, and all parts compresses and forms the well heater described in the present invention.The gap size of hot face bottom fastening block 3 and hot face pedestal 1 side is about 1mm all, required surplus while both having guaranteed assembling, has also guaranteed the insulation between copper-foil conducting electricity 5 and whole metallic structural components (as fastening block 3 bottom hot face pedestal 1, hot face).
The object of the present invention is achieved like this:
Mainly comprise hot face pedestal, hot face upper cover plate, hot face bottom fastening block, ito glass, copper-foil conducting electricity, adiabatic circle, hot face upper cover plate O-ring seal, boiling surface O-ring seal and holding screw.Hot face upper cover plate and hot face bottom fastening block are fixed on hot face pedestal by holding screw, ito glass is clipped between hot face upper cover plate and hot face bottom fastening block, adiabatic circle is positioned at the bottom of ito glass, copper-foil conducting electricity is closely connected as heating electrode with ito glass, hot face upper cover plate O-ring seal is between hot face upper cover plate and hot face pedestal, and boiling surface O-ring seal is between hot face upper cover plate and ito glass.
Ito glass, as boiling surface, is processed into rectangle by diamond pen, and the method by chemical etching is processed into required shape by ITO plated film, and then controls the distribution form of heat flow density on boiling surface.
Hot face pedestal and hot face bottom fastening block are main structure member, by stainless steel, are processed, and hot face upper cover plate is formed by the thick stainless steel printed line cutting processing of 1mm.
Adiabatic circle is the adiabatic circle of epoxy resin, is shaped as hollow, rectangular.。
Between copper-foil conducting electricity and ito glass, by conductive tape, be connected, be about to conductive tape and paste on ITO plated film, utilize hot face bottom fastening block to press copper-foil conducting electricity the two is closely connected.
The chemical etching of ITO plated film completes by ultraviolet development etching method, first use laser printer that required etched shape is printed on film paper, printed film paper is closely attached to and is scribbled on sensitization blue oil ITO plated film, adopt UV-lamp to expose to sensitization blue oil, the rear use developer solution that exposed develops, subsequently ito glass is placed in the mixed solution of watery hydrochloric acid and hydrogen peroxide ITO plated film is carried out to etching, after etching completes, use liquid parting carries out demoulding, the ito glass that can obtain processing.
Hot face O-ring seal is arranged in the seal groove of processing on hot face pedestal, through the fixing hot face upper cover plate afterwards of holding screw, is closely connected with hot face pedestal, middle seamless.
In order to overcome the deficiency of prior art, the designed well heater of the present invention can independently be arranged on any pool boiling internal tank, by different installation sites is set, the area of heating surface can, for being placed horizontally, vertically or tilted, be studied different surfaces towards the impact on the behavior of boiling steam bubble based on this by experiment.
The hot face of the surface boiling heating arrangement described in the present invention adopts ito glass, simultaneously as heating source and boiling surface.Heating power supply adopts direct supply, coordinates control system can heating power be realized accurately and being controlled.Type of heating than from the past conventional resistance type heater to boiling surface heat conduction and radiation heating mode, because ITO plated film is closely connected with glass surface, between the two, thermal resistance is less, therefore can reach higher heat flow density, is conducive to the expansion of experiment parameter scope.On the other hand, type of heating than direct current metal heating plate (or pipe), the not plated film side of ito glass is energising not, reached good insulation effect, and then avoided adding the change of caused working medium conductance after PLIF or PIV trace particle used and the Electrolysis that brings, thereby eliminated the impact of other factors on experiment.
The ITO plated film of ito glass boiling surface adopts ultraviolet development etching method to carry out retrofit to it, makes its surperficial conducting medium reach predetermined distribution.Because the shape of conducting medium is to affect direct current to add the one of the main reasons of hankering heat flux distribution; therefore at controlled ITO plated film, divide and plant the accurate control that can realize heat flux distribution, reach the object that simultaneously realizes high heat flux heating and protection heating arrangement surface.In addition, due to the heat transfer deterioration situation at position, corner, conventional heater can not well be controlled it, and therefore steam bubble produces at sealing position, corner greatly, both the analysis of conducting heat had been produced to larger impact thus, also the shooting of center steam bubble had been caused to certain difficulty.And in the situation that heat flow density is controlled, above impact can be avoided to greatest extent.
Ito glass boiling surface is better than metal boiling surface effect of visualization, and it can reach more than 85% the transmissivity of visible ray, therefore both can to the steam bubble behavior of seething with excitement, observe from boiling surface bottom.In addition also can directly use laser light sheet to irradiate boiling surface from bottom, and then obtain steam bubble temperature field and velocity field information around in conjunction with PLIF-PIV technology.
Between copper-foil conducting electricity and ITO plated film, adopt conductive tape to be connected; conductive tape makes boiling surface sealing surface place there is no the position directly contacting with boiling working medium in same electromotive force; can not produce extra heat; so both realize the protection to boiling surface O-ring seal, also reduced the possibility of edge generation steam bubble.Known by analyzing, the sheet resistance of ITO plated film is 10-15 ohm, tests the relative metal medium of related resistance larger, so in heating process, required electric current is little, adopts conductive tape can meet design requirement completely.In other designs, adopt the processing of silver-plated method to ITO electrode area, the method technique adopting in the present invention is simpler, and cost is lower.
In the process fixing to boiling surface, the present invention has designed hot face upper cover plate it has been fixed.Do not have directly to adopt the main cause of Milling Process moulding to have following 2 points, the first is because the thickness at this position can not be too large, otherwise will have influence on side and observe steam bubble behavior, and the machining precision of milling machine and surface smoothness are difficult to be guaranteed in the situation that the degree of depth is larger.Its two be due to herein for sealing surface and thickness less, therefore can in the situation that meeting with stresses, there is certain deformation, adopt the design of hot face upper cover plate can to this sealing surface, replace very easily.
Hot face upper cover plate O-ring seal is positioned at the seal groove of hot face pedestal, use holding screw will closely cooperate between the two after heating plate O-ring seal and hot face pedestal are fixed and seamless like this, can better guarantee thus the requirement of optical visible.
Adiabatic circle is positioned at the bottom as the ito glass of the area of heating surface, both realized and hot face pedestal between thermal insulation, also as the insulating material between hot face and hot face pedestal.In the present invention, adiabatic circle is processed by epoxy resin, and this material is easily processed, and has higher insulating coefficient and lower thermal conductivity, is processed into the visual requirement that hollow, rectangular has guaranteed hot face bottom.
Claims (5)
- The visual pool boiling experimental provision of 1.PLIF-PIV well heater, is characterized in that: comprise ito glass, left unit heater, right unit heater, left unit heater comprises hot face upper cover plate, hot face pedestal, hot face bottom fastening block, boiling surface O-ring seal, adiabatic circle, copper-foil conducting electricity, the section of hot face pedestal and hot face bottom fastening block is the L-type for consisting of short section and long section all, the long section of the long section of hot face pedestal and hot face bottom fastening block fixes, and the long section of hot face pedestal is positioned at the top of the fastening block length section in hot face bottom, the short section of hot face pedestal is towards below, hot face upper cover plate is fixed on the top of hot face pedestal and has extension with respect to hot face pedestal, the extension of hot face upper cover plate is relative with the short section of hot face bottom fastening block, the left part of ito glass is arranged between the extension of hot face upper cover plate and the short section of hot face bottom fastening block, boiling surface O-ring seal is installed between the extension of the left part of ito glass and hot face upper cover plate, between the left part of ito glass and hot face bottom fastening block, copper-foil conducting electricity is installed successively, adiabatic circle, right unit heater is identical with left unit heater structure, and right unit heater is identical with left unit heater with the assembly relation of ito glass.
- 2. the visual pool boiling experimental provision of PLIF-PIV according to claim 1 well heater, it is characterized in that: described ito glass comprises substrate, on the middle part of substrate, be coated with ITO plated film, the left end of ITO plated film arranges conductive tape with the part that right-hand member is connected with the copper-foil conducting electricity of left unit heater and right unit heater respectively.
- 3. the visual pool boiling experimental provision of PLIF-PIV according to claim 1 and 2 well heater, it is characterized in that: sealing conduit is offered in the upper surface setting of hot face pedestal, in sealing conduit, hot face upper cover plate O-ring seal is installed, the lower surface of the short section of hot face pedestal is offered well heater sealing conduit and well heater screw.
- 4. the visual pool boiling experimental provision of PLIF-PIV according to claim 1 and 2 well heater, is characterized in that: the material of hot face upper cover plate O-ring seal is nitrile rubber; Sealing conduit is rectangular duct through Milling Process, and its width is 3mm, and groove depth is 2mm; Width and the degree of depth of well heater sealing conduit are all 5mm; The material of boiling surface O-ring seal is silica gel; The substrate of ito glass is the sapphire glass of thickness 1.1mm; Adiabatic circle is processed by epoxy resin, and thickness is 2mm; The gap size of the hot face bottom short section of fastening block and the long section of hot face pedestal is 1mm.
- 5. the visual pool boiling experimental provision of PLIF-PIV according to claim 3 well heater, is characterized in that: the material of hot face upper cover plate O-ring seal is nitrile rubber; Sealing conduit is rectangular duct through Milling Process, and its width is 3mm, and groove depth is 2mm; Width and the degree of depth of well heater sealing conduit are all 5mm; The material of boiling surface O-ring seal is silica gel; The substrate of ito glass is the sapphire glass of thickness 1.1mm; Adiabatic circle is processed by epoxy resin, and thickness is 2mm; The gap size of the hot face bottom short section of fastening block and the long section of hot face pedestal is 1mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410298766.2A CN104048986A (en) | 2014-06-26 | 2014-06-26 | PLIF-PIV (planar laser induced fluorescence-particle image velocimetry) visible pool boiling experiment device heater |
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| CN201410298766.2A CN104048986A (en) | 2014-06-26 | 2014-06-26 | PLIF-PIV (planar laser induced fluorescence-particle image velocimetry) visible pool boiling experiment device heater |
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Cited By (3)
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| CN104280416A (en) * | 2014-10-11 | 2015-01-14 | 哈尔滨工程大学 | All-dimensional visual pool type boiling experiment device |
| CN104368407A (en) * | 2014-10-11 | 2015-02-25 | 哈尔滨工程大学 | Multidimensional visualization flow heating experimental device |
| CN104458204A (en) * | 2014-11-20 | 2015-03-25 | 哈尔滨工程大学 | Testing and measuring system for unstable-state flow heat transfer visualization research |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104280416A (en) * | 2014-10-11 | 2015-01-14 | 哈尔滨工程大学 | All-dimensional visual pool type boiling experiment device |
| CN104368407A (en) * | 2014-10-11 | 2015-02-25 | 哈尔滨工程大学 | Multidimensional visualization flow heating experimental device |
| CN104368407B (en) * | 2014-10-11 | 2016-06-29 | 哈尔滨工程大学 | Multiaspect visualization flowing heating experimental device |
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| CN104458204A (en) * | 2014-11-20 | 2015-03-25 | 哈尔滨工程大学 | Testing and measuring system for unstable-state flow heat transfer visualization research |
| CN104458204B (en) * | 2014-11-20 | 2017-04-12 | 哈尔滨工程大学 | Testing and measuring system for unstable-state flow heat transfer visualization research |
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Application publication date: 20140917 |